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Weather April in Knoxville, United States of America Visitors to Knoxville during the month of April should plan on bringing a raincoat since it will be raining some days. The amount of rain is high with an average of 83mm (3.3in). The average maximum temperature lies around 16.0Â°C (60.8Â°F). This month is known as a chilly month.
In the Memphis area in the southwest, the average date of the last killing frost is 20 March, and the growing season is about 235 days. Memphis has an annual mean temperature of 62Â°F (17Â°C), 40Â°F (4Â°C) in January, and 83Â°F (28Â°C) in July.he Knoxville area has a growing season of 220 days. The city's annual mean temperature is 60Â°F (16Â°C), with averages of 41Â°F (5Â°C) in January and 78Â°F (26Â°C) in July. In some parts of the mountainous east, where the temperatures are considerably lower, the growing season is as short as 130 days.